Astrophyllite and Sillimanite Physical Properties
Tenacity
Not Available
Tough
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.2-3.4
3.20-3.26
Fracture
Uneven, Brittle, Metallic
Splintery
Cleavage
Perfect on [001] imperfect on [100]
{010} perfect
Chemical Composition
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Astrophyllite and Sillimanite Chemical Formula
While comparing Astrophyllite and Sillimanite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Astrophyllite and Sillimanite chemical formula.
- Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Astrophyllite and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Astrophyllite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.